Atom 1 has 19 electrons 19 protons and 20 neutrons atoms 2 has 19 electrons , 20 neutrons and 19 protons

Atom 1: Potassium (K)

Atom 2: Same thing

Explanation:

Potassium has an atomic number of 19 and mass number of 39.0983.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates